RIAIT (Italian Registry of Allergy Immunotherapy) is a multicenter observational study that aims to prospectively collect the most extensive data available on Italian patients using AIT for respiratory allergies (rhinoconjunctivitis and/or asthma) in a real-life context, through a network of allergy centers with specific interest and expertise in the management of allergic respiratory patients.

Objectives include:

• Evaluate short and long-term real-life effectiveness and safety of AIT overall, in specific patient groups' phenotypes and with specific AIT products.
• Evaluate the pertinence and differences in suggesting AIT to a patient comparing physician's evaluation in various settings with established international guidelines, describing the factors associated with treatment choices and changing over time, and promoting interoperability, data sharing, and cross-comparison among centers.
• Describe long-term respiratory allergic disease evolution in patients treated with AIT.
• Describe the natural history of the patient population with respiratory allergies and identify patient groups describing their illness burden, management patterns, and clinical progression.
• Promote the creation of accurate, standardized, and efficient processes for diagnosing and treating respiratory allergic diseases, especially with AIT.
• Assess biomarker data to predict diagnosis, treatment response and long-term disease progression.

Inclusion Criteria:

• Age ≥ 1 year
• Confirmed diagnosis of allergic rhinoconjunctivitis and/or allergic asthma according to EAACI 2019 guidelines.
• Having been followed by the recruiting center for at least one month: this is considered necessary to establish that the patients are truly affected by allergic respiratory disease and are eligible for allergen-specific immunotherapy; in this period, screening tests are carried out to exclude and/or confirm concomitant diseases (comorbidities). In fact, according to the aforementioned EAACI guidelines, a patient can be defined as truly eligible for allergen-specific immunotherapy only after a preliminary phase in which the patient is treated with symptomatic therapy; this observation period allows a correct evaluation of the real adherence and response to therapy, as well as the identification and appropriate treatment of any comorbidity and the possible elimination of aggravating factors.
• Having received the prescription of any of the available AIT products in Italy, irrespectively of the selected allergens and the administration route and schedule.

Exclusion Criteria:

There will no be exclusion criteria, in order to allow a real-life vision of the characteristics of these patients eligible for or treated with allergen-specific immunotherapy.

RIAIT is a prospective multicenter observational registry of patients suffering from conjunctivitis, rhinitis, and/or allergic asthma eligible for and treated with AIT according to EAACI (European Academy of Allergy and Clinical Immunology) Guidelines.